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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Structure of a nucleosome Structure of a nucleosome
Skull Right Lateral View Labeled Skull Right Lateral View Labeled
The b sheet, another common secondary structure in proteins The b sheet, another common secondary structure in proteins
Levels of protein structure. Levels of protein structure.
Sagittal section, medial view of the pons Sagittal section, medial view of the pons
The Thoracic Vertebrae: Right Lateral View of Vertebra The Thoracic Vertebrae: Right Lateral View of Vertebra
Video: X chromosome inactivation in calico cats

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